JP6558128B2 - Coil device - Google Patents

Description

  The present invention relates to a coil device that is mainly used in, for example, a power supply circuit and has excellent direct current superposition characteristics.

  For example, in Patent Document 1 below, an attempt is made to cope with a narrow deviation of the combined inductance by adjusting the number of turns of two coil portions wound around a common core portion.

  However, in the coil device shown in Patent Document 1, the combined inductance is increased by the number of turns of the wire constituting the coil section. Therefore, in order to increase the combined inductance, the number of turns of the wire is inevitably increased. There is a need. As the number of turns of the wire increases, the DC resistance Rdc of the coil increases and the loss also increases. In addition, since the number of turns of the wire increases, it is difficult to reduce the height of the coil device.

  Furthermore, in the coil device shown in Patent Document 1, the coupling coefficient of the coil is changed by increasing the number of flanges formed on the core part. However, in the structure shown in Patent Document 1, the coupling coefficient is changed. It is difficult to adjust freely.

JP 2006-196639 A

  The present invention has been made in view of such a situation, and an object of the present invention is to provide a coil device that has excellent direct current superposition characteristics, can be reduced in height, has a large inductance, and can freely change the coupling coefficient. Is to provide.

In order to achieve the above object, a coil device according to the present invention comprises:
A winding core,
A first end collar portion provided at one end portion along a first axis that is a winding axis direction of the core portion;
A second end collar provided at the other end along the first axis of the core;
The first shaft and the third shaft are arranged with a predetermined end gap along a third axis perpendicular to the first axis with respect to both the first and second end flanges. A substantially plate-like plate core having a plane including a second axis perpendicular to the first axis and the first axis;
An intermediate magnetic path forming portion disposed between the plate core and the core portion between the pair of first and second end flanges along the first axis;
A first wire that is wound around the core portion located between the first end flange portion and the intermediate magnetic path forming portion, and constitutes a first coil portion;
A second wire that is wound around the core portion located between the second end flange portion and the intermediate magnetic path forming portion and constitutes a second coil portion.

  The first coil portion and the second coil portion can easily adjust the direction of the magnetic flux in the direction in which the magnetic flux cancels each other. Therefore, the coil device of the present invention is excellent in DC superposition characteristics.

  Further, the coil device is configured by combining the core portion having the first end flange portion and the second end flange portion and the plate core, and further, since the intermediate magnetic path forming portion is disposed, these are closed magnetic paths. The inductance can be increased without increasing the number of turns of each coil part. Since the inductance can be increased without increasing the number of turns of the coil portion, the apparatus can be easily reduced in height.

  Further, the size of the end gap between the plate core and the end flange, and the size of the intermediate gap between the intermediate magnetic path forming portion and the plate core, or the intermediate gap between the intermediate magnetic path forming portion and the core portion. The coupling coefficient can be freely adjusted by changing the relationship with By freely changing the coupling coefficient, the frequency characteristic can be adjusted by adjusting the leakage inductance without newly providing a coil element.

  Preferably, the winding core portion, the first end flange portion, the second end flange portion, and the intermediate magnetic path forming portion are integrated by a magnetic member, and the plate core is magnetically separated from the magnetic member. It consists of members. In this case, an intermediate gap is provided along the third axis between the intermediate magnetic path forming portion and the plate core.

  Alternatively, the core portion, the first end collar portion, and the second end collar portion are integrated with a magnetic member, and the plate core and the intermediate magnetic path forming portion are magnetically separate from the magnetic member. You may comprise by the member. In that case, an intermediate gap is provided along the third axis between the intermediate magnetic path forming portion and the core portion.

  A sub projection portion integrated with the core portion may be formed on the core portion located on the opposite side of the intermediate magnetic path forming portion along the third axis. By forming the sub-projections, further increase in inductance can be expected. In addition, the formation of the sub-projections also has the effect of reducing the coupling coefficient.

  Side protrusions protruding in the direction of the second axis perpendicular to the first axis and the third axis may be formed continuously with the sub protrusion. By forming the side protrusions, further increase in inductance can be expected. In addition, the formation of the side protrusions also has the effect of reducing the coupling coefficient.

  Preferably, the thickness of the sub-projection portion along the first axis direction is smaller than the thickness of the intermediate magnetic path forming portion along the first axis. With this configuration, it is possible to easily wire the wires constituting each coil portion while increasing the inductance, which contributes to downsizing of the device.

  Preferably, a terminal to which both ends of the first wire are connected is attached to the first end flange, and both ends of the second wire are connected to the second end flange, respectively. The terminal to be attached is installed. By configuring in this way, wiring of the wires constituting each coil part is facilitated, which contributes to downsizing of the apparatus.

FIG. 1 is an overall perspective view of a coil device according to an embodiment of the present invention. FIG. 2 is a perspective view of the drum core obtained by removing the plate core from the coil device shown in FIG. FIG. 3 is a perspective view of the drum core shown in FIG. 2 as viewed from the opposite side in the Z-axis direction. 4 is a partial cross-sectional front view of the coil device shown in FIG. 1 viewed from the Y-axis direction. FIGS. 5A and 5B are circuit diagrams showing examples of the circuit of the coil device shown in FIG. 1, respectively. FIG. 5C is a diagram of FIG. 5A when the coupling coefficient k is 0 <k <1. Or an equivalent circuit diagram of FIG. FIG. 6A shows changes in leakage inductance based on the presence and shape of the intermediate core. FIG. 6B shows the change of the coupling coefficient k based on the presence and the shape of the intermediate core. FIG. 7 is a perspective view of a coil device according to another embodiment of the present invention. FIG. 8 is a perspective view of a coil device according to still another embodiment of the present invention. 9 is a perspective view of the drum core with the plate core removed from the coil device shown in FIG. It is. FIG. 10 is a perspective view showing a modified example of the drum core used in the coil device according to another embodiment of the present invention. FIG. 11 is a partial cross-sectional front view showing a coil device according to another embodiment of the present invention.

  Hereinafter, the present invention will be described based on embodiments shown in the drawings.

First Embodiment As shown in FIG. 1, a coil device 10 according to an embodiment of the present invention includes a drum core 20, a plate core 30, and a coil portion 40 wound around a core portion 22 of the drum core 20. Have

  In the description of the coil device 10, the direction parallel to the winding axis of the core portion 22 of the drum core 20 in the plane parallel to the mounting surface on which the coil device 10 is mounted is parallel to the mounting surface in the same manner as the X axis and the X axis. The direction perpendicular to the X axis in the plane is the Y axis direction, and the normal direction of the mounting surface is the Z axis direction.

  The outer dimensions of the coil device 10 are, for example, (X-axis direction length 2.5 to 3.2 mm × Z-axis direction height 1.0 to 2.0 mm × Y-axis direction width 2.0 to 2.5 mm). However, the size of the coil device 10 is not limited to this.

  As shown in FIG. 2, the drum core 20 has a winding core 22 having a winding axis in the X-axis direction and a rectangular cross section elongated in the Y-axis direction, and a pair provided at both ends of the winding core 22 in the X-axis direction. First end flange portion 24a and second end flange portion 24b. In addition, although the cross-sectional shape of the core part 22 is a rectangle in this embodiment, circular shape may be sufficient and the cross-sectional shape is not specifically limited.

  The outer shape of each of the first end collar part 24a and the second end collar part 24b is a substantially rectangular parallelepiped elongated in the Y-axis direction, and these collar parts 24a and 24b are spaced apart with respect to the X-axis direction, It arrange | positions so that it may mutually become substantially parallel. The winding core part 22 is connected to the center part of each surface facing each other in the pair of flange parts 24a and 22b, and connects the pair of flange parts 24a and 22b.

  At the intermediate position in the X-axis direction of the core part 22, an intermediate collar part 26 is formed integrally with the core part 22, and the core part 22 is separated into two core sections 22a and 22b in the X-axis direction. Has been. The intermediate brim part 26 has a main projection part 26a projecting from the core part 22 in the Z-axis direction toward the plate core 30, and on the opposite side of the main projection part 26a in the Z-axis direction from the core part 22 to the Z-axis. And a pair of side projections 26c projecting in the Y-axis direction from the core 22 so that the main projections 26a and the sub-projections 26b are integrated and connected. Have. In the present embodiment, the main protrusion 26a serves as an intermediate magnetic path forming member.

  A first wire 41 and a second wire 42 are wound around the core sections 22a and 22b of the core section 22 separated by the intermediate collar section 26, respectively. The first coil section 40a and the second coil section are respectively wound. 40b is configured. The wires 41 and 42 are made of, for example, coated conductors, and have a structure in which a core material made of a good conductor is covered with an insulating coating film. In the present embodiment, the cross-sectional areas of the conductor portions of the wires 41 and 42 are the same, but they may be different.

  As shown in FIG. 3, terminals 51 and 52 are provided at predetermined intervals along the Y-axis direction on the first end flange 24 a of the drum core 20. Further, terminals 53 and 54 are provided on the second end flange 24b at predetermined intervals along the Y-axis direction. Each terminal 51-54 is comprised with the metal fitting which has a substantially L-shaped outer shape, and at least main part 51a-54a of each terminal 51-54 is provided in 1st main surface 24a1, 24b1 of the collar parts 24a, 24b. It has been. The first main surfaces 24a1 and 24b1 of the flange portions 24a and 24b are surfaces opposite to the side where the plate core 30 shown in FIG. 1 is provided in the Z-axis direction, and the coil device 10 is mounted on a circuit board, for example. It becomes the installation surface in the case of doing.

  The two terminals 51 and 52 are provided on one flange 24a, and the other two terminals 53 and 54 are provided on the other flange 24b by means such as adhesion. The interval between the adjacent terminals 51, 52 or 53, 54 is not particularly limited as long as it is a distance that ensures insulation.

  As described above, the core portion 22 of the drum core 20 is separated into the two sections 22a and 22b in the X-axis direction by the intermediate flange 26, and the first wire 41 and the second wire are respectively provided in the sections 22a and 22b. 42 are wound, and respectively constitute a first coil part 40a and a second coil part 40b.

  As shown in FIG. 3, the wire ends 41a and 41b of the first wire 41 are connected to the main portions 51a and 52a of the terminals 51 and 52, respectively, and the wire ends 42a and 42b of the second wire 42 are connected to the terminals 53 and 52, respectively. 54 is connected to main parts 53a and 54a. As shown in FIG. 5 (A), terminals 52 and 54 can be directly connected by an external circuit, for example, and as shown in FIG. 5 (B), terminals 52 and 54 are externally connected, for example. It can be connected directly in the circuit.

  In the circuit shown in FIG. 5A, as shown in FIG. 3, the winding direction of each wire 41, 42 is the same in the first coil 40a and the second coil 40b, and the terminal 52 and the terminal 54 are connected to each other. This is the case when the potential is the same. The circuit shown in FIG. 5B is a case where the winding directions of the wires 41 and 42 are opposite in the first coil 40a and the second coil 40b, and the terminal 52 and the terminal 53 have the same potential. .

  In the present embodiment, the first coil 40a and the second coil 40b have substantially the same number of turns of the wires 41 and 42, but may be different depending on the application. The number of turns of each wire 41, 42 is substantially the same, the ratio of the number of turns is in the range of 0.75 to 1 / 0.75, preferably 1. In the present embodiment, the inductance L1 of the first coil 40a and the inductance L2 of the second coil 40b are substantially the same.

  As shown in FIG. 4, in this embodiment, the plate core 30 is attached to the surface of the drum core 20 opposite to the first main surfaces 24a1 and 24b1 along the Z-axis direction by the adhesive 50 or other means. It is connected. As shown in FIG. 1, the plate core 30 is a substantially rectangular plate-like core whose dimensions in the X-axis and Y-axis directions substantially coincide with the drum core 20. Although the thickness of the plate core 30 in the Z-axis direction is not particularly limited, for example, it is about 2/5 to 1/1 of the thickness in the Z-axis direction of the end flanges 24a and 24b.

  In the present embodiment, a predetermined end gap α is formed along the Z axis between the second main surface 24a2 opposite to the first main surface 24a1 of the first end collar 24a and the opposing surface 30a of the plate core 30. Is formed. Similarly, a predetermined end gap α is formed along the Z axis between the second main surface 24b2 opposite to the first main surface 24b1 of the second end flange 24b and the opposing surface 30a of the plate core 30. It is. These end gaps α are filled with the adhesive 50 and the plate core 30 and the drum core 20 are connected. However, when the plate core 30 and the drum core 20 are connected by means other than the adhesive 50. In addition, it is not necessary to fill the adhesive 50 in these end gaps α.

  Further, a predetermined intermediate gap β is formed along the Z-axis between the second main surface 26a1 of the intermediate flange portion 26 and the facing surface 30a of the plate core 30. The intermediate gap β is filled with the adhesive 50. However, if the end flange portions 24a and 24b and the plate core 30 are connected by the adhesive 50 or other means, the intermediate gap β has an adhesive. 50 need not be filled.

  In the present embodiment, by controlling the size of the gap β, the coupling coefficient k between the coil portions 40a and 40b shown in FIGS. 5A and 5B can be controlled, and the gap α can be controlled. By controlling the size, it is possible to control the open circuit inductances (OCL) L1 and L2 of the coil portions 40a and 40b.

  For example, when the coupling coefficient k is decreased and the inductance L1 or L2 is desired to be decreased, the end gap α is increased and the central gap β is decreased (α> β). Further, when it is desired to increase the coupling coefficient k and increase the inductance L1 or L2, the end gap α may be decreased and the central gap β may be increased (β> α). Furthermore, when it is desired to reduce the coupling coefficient k and increase the inductance L1 or L2, it is only necessary to reduce the end gap α and the central gap β (both are small when β≈α).

  As the coupling coefficient k increases, the leakage inductance decreases. When the coupling coefficient k decreases, the leakage inductance increases. For example, when the leakage inductance is increased to 200 nH or more (coupling coefficient k is decreased) and the inductance L1 or L2 is increased to 600 nH or more, the end gap α is reduced to about 10 μm or less and the central gap β is set to 10 μm or less. Just make it smaller.

  If the opposing surface 30a of the plate core 30 is a flat surface, the width of the end gap α and the center gap β can be controlled from the core portion 22 to the second main surfaces 24a2, 24b2 of the end flange portions 24a, 24b. This is performed by adjusting the axial distance and the Z-axis direction distance from the winding core portion 22 to the second main surface 26a1 of the intermediate flange portion 26.

  In the present embodiment, as shown in FIG. 4, the protrusion height of the sub-projection portion 26 b that protrudes in the Z-axis direction on the opposite side of the main projection portion 26 a is the Z-axis with respect to the core portion 26 of the end flange portions 24 a and 24 b It is preferably the same as the protruding height in the direction, but may be different. Further, as shown in FIG. 3, the protrusion height of the pair of side protrusions 26c protruding in the Y-axis direction from the core portion 22 is also the protrusion height in the Y-axis direction of the end flange portions 24a and 24b with respect to the core portion 26. It is preferable to be the same level as the above, but it may be different.

  In particular, in the present embodiment, as shown in FIG. 4, it is preferable that the X-axis direction width X1 of the main projection 26a is larger than the X-axis direction width X2 of the sub-projection 26b. The X-axis direction width X2 of the sub-projection portion 26b is 0 from the viewpoint that the wire end 41b of the first wire 41 and the wire end 42a of the second wire 42 do not interfere with the wiring toward each terminal 52 or 53. Although the width X2 is set to be larger than 0, preferably 0.05 mm or more, the inductances L1 and L2 shown in FIGS. 5A and 5B can be increased.

  In the present embodiment, the coupling coefficient k can be reduced and the leakage inductance can be increased by increasing the X-axis direction width X1 of the main protrusion 26a as the intermediate magnetic path forming portion. For example, as shown in FIGS. 6A and 6B, the coil according to the first embodiment having the intermediate flange portion X1 = X2 = 0.07 mm as compared with the coil device according to the comparative example not having the intermediate flange portion 26. In the apparatus, the coupling coefficient k decreases and the leakage inductance increases. Further, in the coil device according to the second embodiment having the intermediate flange portion 26 with X1 = 0.15 mm and X2 = 0.07 mm, the coupling coefficient k is further reduced as compared with the first embodiment, and the leakage inductance is further increased. growing. The data shown in FIGS. 6A and 6B is data when the plate core 30 shown in FIG. 4 is provided.

  In manufacture of the coil apparatus 10, the drum-type drum core 20, the plate core 30, and the wires 41 and 42 which installed the terminals 51-54 are prepared first. The drum core 20 and the plate core 30 are each composed of separate magnetic members, but these materials are preferably the same, but may be composed of separate magnetic materials.

  Examples of the magnetic material include a magnetic material having a relatively high magnetic permeability, such as Ni—Zn ferrite, Mn—Zn ferrite, or metal magnetic material, and powders of these magnetic materials are molded. And the drum core 20 and the plate core 30 are produced by sintering. The drum core 20 is integrally formed with a winding core portion 22, end flange portions 24 a and 24 b, and an intermediate flange portion 26.

  The metal terminals 51 to 54 are fixed to the flange portions 24a and 24b of the drum core 20 by bonding or the like. The terminals 51 to 54 may be provided on the flange portions 24a and 24b by forming a conductor film on the drum core 20 by printing, plating or the like, and baking the conductor film.

  As the wires 41 and 42, for example, a core material made of a good conductor such as copper (Cu) is covered with an insulating material made of imide-modified polyurethane and the outermost surface is covered with a thin resin film such as polyester. Can do. The drum core 20 and the wires 41 and 42 on which the prepared terminals 51 to 54 are installed are set in a winding machine, and the wires 41 and 42 are wound around the core portions 22a and 22b of the drum core 20 in a predetermined order. .

  In the coil device 10 according to the present embodiment, the direction of the magnetic flux acts in the direction in which the first coil portion 40a and the second coil portion 40b cancel each other. Therefore, in the coil device 10 according to the present embodiment, the magnetic flux cancels each other and is not easily saturated, and the inductance does not drop even when a current is passed.

  In addition, the coil core 10 is configured by combining the drum core 20 and the plate core 30. Further, since the main projection portion 26a as the intermediate magnetic path forming portion is disposed in the intermediate flange portion 6, these are closed. It is possible to increase the inductances L1 and L2 without configuring the path and increasing the number of turns of the coil portions 40a and 40b. Since the inductances L1 and L2 can be increased without increasing the number of turns of the coil portions 40a and 40b, it is easy to reduce the height of the device 10 in the Z-axis direction. Further, since it is not necessary to increase the number of turns, the DC resistance Rdc does not increase and the loss can be reduced.

  Furthermore, by changing the relationship between the size of the end gap α between the plate core 30 and the end flanges 24a, 24b and the size of the intermediate gap β between the main projection 26a and the plate core 30, It is possible to freely adjust the coupling coefficient k and the inductances L1 and L2. By freely changing the coupling coefficient k, it is possible to adjust the frequency characteristics by adjusting the leakage inductance without providing a separate coil element.

  Further, in the present embodiment, since the intermediate collar part 26 has the sub-projection part 26b, further increase in inductance can be expected. In addition, having the sub-projection portion 26b also has an effect of further reducing the coupling coefficient k. The side protrusion 26 has the same function.

  Furthermore, in this embodiment, the width X2 along the X-axis direction of the sub-projection portion 26b is smaller than the width X1 of the main projection portion 26a along the X-axis. With this configuration, the wires 41 and 42 constituting the coil portions 40a and 40b can be easily wired while increasing the inductance, which contributes to the downsizing of the apparatus 10.

  Furthermore, in the present embodiment, terminals 51 and 52 to which both ends of the first wire 41 are connected are attached to the first end collar 24a, and the second wire is attached to the second end collar 24b. Terminals 53 and 54 to which both ends of 42 are connected are mounted. With this configuration, wiring of the wires 41 and 42 constituting the coil portions 40a and 40b is facilitated, which contributes to downsizing of the device 10.

  The coil device of the present embodiment is preferably used as a coil device around a power supply, and can generate a large current of, for example, 5 amperes or more, and can be used for applications such as a coupling inductor and an IC power supply coil. it can.

Second Embodiment As shown in FIG. 7, a coil device 10a according to a second embodiment of the present invention is different only in the following points, and other configurations are the same as those of the first embodiment described above. The same operational effects are achieved, and the description of the overlapping parts is omitted. In this embodiment, as shown in FIG. 7, the plate core 30 is joined to the first main surfaces 24a1, 24b1 of the drum core 20 shown in FIG. That is, the first main surfaces 24a1 and 24b1 face the facing surface 30a of the plate core 30, and the second main surfaces 24a2 and 24b2 serve as installation surfaces of the coil device 10a.

  Moreover, in this embodiment, the sub projection part 26b of the intermediate collar part 26 faces the opposing surface 30a of the plate core 30, and comprises the intermediate | middle magnetic path formation part. In the present embodiment, the X-axis direction width of the sub-projection portion 26b constituting the intermediate magnetic path forming portion is the X-axis direction of the main projection portion 26a constituting the intermediate magnetic path forming portion of the first embodiment. It becomes smaller than the width. Other configurations and operational effects are the same as those of the first embodiment.

Third Embodiment As shown in FIGS. 8 and 9, the coil device 10b according to the third embodiment of the present invention is different only in the following points, and other configurations are the same as those in the first embodiment or the above-described first embodiment. It is the same as that of 2nd Embodiment, and there exists the same effect, The description of the overlapping part is abbreviate | omitted. In this embodiment, as shown in FIGS. 8 and 9, the attachment positions of the terminals 51 to 54 provided on the drum core 20 b to which the plate core 30 is joined are different from the above-described embodiments.

  As shown in FIG. 9, in this embodiment, the main portions 51a and 52a of the terminals 51 and 52 to which the wire ends 41a and 41b of the first wire 41 constituting the first coil portion 40a are connected are respectively the first end. It joins to the both end surfaces of the Y-axis direction of the collar part 24a. Further, the main portions 53a and 54a of the terminals 53 and 54 to which the wire ends 42a and 42b of the second wire 42 constituting the second coil portion 40b are connected are respectively end surfaces in the Y-axis direction of the second end flange portion 24b. Is joined. Other configurations and operational effects are the same as those of the first embodiment or the second embodiment.

Fourth Embodiment As shown in FIG. 10, the drum core 20c used in the coil device according to the fourth embodiment of the present invention is different only in the following points, and other configurations are the same as those of the first embodiment described above. -Similar to the third embodiment, the same effects are obtained, and the description of overlapping parts is omitted. In this embodiment, as shown in FIG. 10, only the main projection 126a and the sub projection 126b are formed on the intermediate flange 126 of the drum core 20c. The part 26c is not formed. In the present embodiment, the main projection 126a constitutes an intermediate magnetic path forming portion, but the sub projection 126b may constitute an intermediate magnetic path forming portion.

  In addition, the intermediate collar part 126 of this embodiment respond | corresponds to the intermediate collar part 26 of embodiment mentioned above. Other configurations and operational effects are the same as those of the first embodiment or the second embodiment.

Fifth Embodiment As shown in FIG. 11, the coil device 10c according to the fifth embodiment of the present invention is different only in the following points, and other configurations are the same as those in the first to fourth embodiments described above. It is the same as that of the form, produces the same effect, and the description of the overlapping part is omitted.

  In this embodiment, as shown in FIG. 11, the intermediate flange 26 or 126 is not formed on the drum core 20d. Instead, at the position where the intermediate flange portion in the first to fifth embodiments is formed on the drum core, the main protrusion 130b is formed as an intermediate magnetic path forming portion on the intermediate portion in the X-axis direction on the facing surface 130a of the plate core 130. Is formed.

  The tip end of the main projection 130b in the Z-axis direction is arranged to face the core portion 22 with a predetermined intermediate gap β. In the present embodiment, the winding core portion 22, the first end flange portion 24a, and the second end flange portion 24b constituting the drum core 20d are integrated with a magnetic member, and the 130 plate core and the main projection portion 130b are integrated with each other. The drum core 20d is composed of a magnetic member separate from the magnetic member. In the present embodiment, an intermediate gap β is provided along the Z axis between the main protrusion 130 b and the core portion 22.

  In the present embodiment, the coupling coefficient k can be freely adjusted by changing the relationship between the size of the end gap α and the size of the intermediate gap β between the main protrusion 130 b and the core portion 22. is there. By freely changing the coupling coefficient k, it is possible to adjust the frequency characteristics by adjusting the leakage inductance without providing a separate coil element.

  The substantially plate shape in the plate core means that protrusions such as a main protrusion 130b are formed on a part of a flat plate core having a plane including the X axis and the Y axis as shown in FIG. The idea is that you may. Other configurations and operational effects are the same as those in the first to fourth embodiments.

  The present invention is not limited to the above-described embodiment, and can be variously modified within the scope of the present invention.

10, 10a, 10b, 10c ... Coil device 20, 20a ... Drum core 22 ... Core portions 24a, 24b ... End flange portion 26 ... Intermediate flange portion 30, 130 ... Plate core 130, 30 ... Plate core 40 ... Coil portion 40a ... Main projection 40b ... Sub projection 41, 42 ... Wire 41a, 42a ... Wire end 51-54 ... Terminal

Claims (7)

A winding core,
A first end collar portion provided at one end portion along a first axis that is a winding axis direction of the core portion;
A second end collar provided at the other end along the first axis of the core;
The first shaft and the third shaft are arranged with a predetermined end gap along a third axis perpendicular to the first axis with respect to both the first and second end flanges. A substantially plate-like plate core having a plane including a second axis perpendicular to the first axis and the first axis;
An intermediate magnetic path forming portion disposed between the plate core and the core portion between the pair of first and second end flanges along the first axis;
A first wire that is wound around the core portion located between the first end flange portion and the intermediate magnetic path forming portion, and constitutes a first coil portion;
A second wire that is wound around the core portion located between the second end flange portion and the intermediate magnetic path forming portion and constitutes a second coil portion;
The core portion located on the opposite side of the intermediate magnetic path forming portion along the third axis has a sub-projection portion integrated with the core portion,
The coil device, wherein a thickness of the sub-projection portion along the first axis direction is smaller than a thickness of the intermediate magnetic path forming portion along the first axis. The core part, the first end collar part, the second end collar part, and the intermediate magnetic path forming part are integrated with a magnetic member,
The plate core is composed of a magnetic member separate from the magnetic member,
The coil device according to claim 1, wherein an intermediate gap is provided along the third axis between the intermediate magnetic path forming portion and the plate core. A winding core,
A first end collar portion provided at one end portion along a first axis that is a winding axis direction of the core portion;
A second end collar provided at the other end along the first axis of the core;
The first shaft and the third shaft are arranged with a predetermined end gap along a third axis perpendicular to the first axis with respect to both the first and second end flanges. A substantially plate-like plate core having a plane including a second axis perpendicular to the first axis and the first axis;
An intermediate magnetic path forming portion disposed between the plate core and the core portion between the pair of first and second end flanges along the first axis;
A first wire that is wound around the core portion located between the first end flange portion and the intermediate magnetic path forming portion, and constitutes a first coil portion;
A second wire that is wound around the core portion located between the second end flange portion and the intermediate magnetic path forming portion and constitutes a second coil portion;
The core part, the first end collar part and the second end collar part are integrated with a magnetic member,
The plate core and the intermediate magnetic path forming part are composed of a magnetic member separate from the magnetic member,
A coil device in which an intermediate gap is provided along the third axis between the intermediate magnetic path forming portion and the core portion.   4. The coil according to claim 3, wherein the winding core portion located on the opposite side of the intermediate magnetic path forming portion along the third axis is formed with a sub-projection portion integrated with the winding core portion. apparatus. Lateral projection portion projecting in the direction of the second axis perpendicular to the first axis and the third axis, according to any one of the claims 1, 2, 4 to the auxiliary protruding portion is formed continuously Coil device.   Terminals to which both ends of the first wire are respectively connected are attached to the first end collar, and terminals to which both ends of the second wire are respectively connected to the second end collar. The coil device according to claim 1, wherein the coil device is attached. A winding core,
A first end collar portion provided at one end portion along a first axis that is a winding axis direction of the core portion;
A second end collar provided at the other end along the first axis of the core;
The first shaft and the third shaft are arranged with a predetermined end gap along a third axis perpendicular to the first axis with respect to both the first and second end flanges. A substantially plate-like plate core having a plane including a second axis perpendicular to the first axis and the first axis;
An intermediate magnetic path forming portion disposed between the plate core and the core portion between the pair of first and second end flanges along the first axis;
A first wire that is wound around the core portion located between the first end flange portion and the intermediate magnetic path forming portion, and constitutes a first coil portion;
A second wire that is wound around the core portion located between the second end flange portion and the intermediate magnetic path forming portion and constitutes a second coil portion;
The core portion located on the opposite side of the intermediate magnetic path forming portion along the third axis has a sub-projection portion integrated with the core portion,
The coil device, wherein a thickness of the intermediate magnetic path forming portion along the first axis is smaller than a thickness of the sub-projection portion along the first axis direction.

Images